Hey Oh...,
Here's a nice description of the first 3 Glock generations for you:
http://www.thehighroad.org/showthread.php?t=414562and here's a good look at the new 4th gen:
http://www.ldspreppers.com/showthread.php/1798-Glock-4th-Generation-Unveiled(hope those links worked!)
I have the 19 and the 26 (both gen 3) and LOVE them both- I use the 19 for open carry and (only very recently) the 26 for concealed carry. These Glocks just work- clean or dirty they are tough, reliable/dependable, accurate, quick to field strip/easy to clean. I've never had ANY issues with either of these nugs EVER with many kinds of ammo- and that is what I've heard and read other Glock owners report too.
That is just my current 2 cents worth on my current choices- there are MANY other good pistol choices out there as well (most notably for me the S&W M&P, SIG, Ruger, and Kahr) as I'm sure you will be reading all about after this posts!
I only wish I could have one of EACH type of gun to try out! Peace to all gun owners who have made different choices out there, certainly no disrespect intended to anyone. Just trying to convey... THE TRUTH! ...
[lol!] Pete D.---